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                    <h1>Android-框架：Retrofit简单使用（二）</h1>
                    
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                         作者 Leeves
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                          日期 2016-09-26
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            Android-框架：Retrofit简单使用（二）
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                <p>啦啦啦，本次换个角度，从获取Json来进行Retrofit学习，以便以后很很很小白的人看了，也能够快速上手。。<br>　　两个Json：<br>　　<code>https://api.github.com/repos/square/retrofit/contributors</code><br>　　<code>https://api.github.com/search/users?q=retrofit</code><br>　　<br>　　点进去后，自己对比下，一个可以说是JsonArray，另一个是JsonObject。两者区别，详见<a href="http://stackoverflow.com/questions/12289844/difference-between-jsonobject-and-jsonarray" target="_blank" rel="noopener">这里</a>。</p>
<h2 id="1-创建接收Json数据的Java类"><a href="#1-创建接收Json数据的Java类" class="headerlink" title="1.创建接收Json数据的Java类"></a>1.创建接收Json数据的Java类</h2><p>这里介绍一个插件，Android studio中，在Settings——Plugins中，下载GsonFormat。<br>使用方法如下：<br>　　<br>Generate<br><img src="http://lixin.piaozu.com.cn/RetrofitDemo4.jpg" alt="此处输入图片的描述"><br>　　<br>把Json复制进去<br><img src="http://lixin.piaozu.com.cn/RetrofitDemo5.jpg" alt="此处输入图片的描述"><br>　　<br>这里可以看到详细类型数值<br><img src="http://lixin.piaozu.com.cn/RetrofitDemo6.jpg" alt="此处输入图片的描述"><br>　　因为是两个不同类型的Json，所以要创建两个类。<br></p>
<h2 id="2-使用Retrofit获取Json值"><a href="#2-使用Retrofit获取Json值" class="headerlink" title="2.使用Retrofit获取Json值"></a>2.使用Retrofit获取Json值</h2><p>怎么简单使用Retrofit上篇讲过啦，不懂回去温习下  <a href="https://leevsee.github.io/2016/09/25/Android-%E6%A1%86%E6%9E%B6%EF%BC%9ARetrofit%E7%AE%80%E5%8D%95%E4%BD%BF%E7%94%A8%EF%BC%88%E4%B8%80%EF%BC%89/">Android-框架：Retrofit简单使用（一）</a>。<br>首先是JsonArray怎么获取：</p>
<pre><code>public interface GitHubRequestAPI {
    @GET(&quot;repos/{user}/{repo}/contributors&quot;)
    Call&lt;List&lt;GsonArrayExample&gt;&gt; getGitHubSearch(@Path(&quot;user&quot;) String userName, @Path(&quot;repo&quot;) String repoName);
}


Retrofit retrofit = new Retrofit.Builder()
        .baseUrl(&quot;https://api.github.com/&quot;)
        .addConverterFactory(GsonConverterFactory.create())
        .build();

GitHubRequestAPI gitHubRequestAPI = retrofit.create(GitHubRequestAPI.class);
</code></pre><p>　　</p>
<pre><code>Call&lt;List&lt;GsonArrayExample&gt;&gt; call = gitHubRequestAPI.getGitHubSearch(&quot;square&quot;,&quot;retrofit&quot;);
call.enqueue(new Callback&lt;List&lt;GsonArrayExample&gt;&gt;() {
        @Override
        public void onResponse(Call&lt;List&lt;GsonArrayExample&gt;&gt; call, Response&lt;List&lt;GsonArrayExample&gt;&gt; response) {
            List&lt;GsonArrayExample&gt; list = response.body();
            for(GsonArrayExample gsonArrayExample : list){
                Log.i(&quot;获得JsonArray中的login：&quot;,gsonArrayExample.getlogin);
            }
        }

        @Override
        public void onFailure(Call&lt;List&lt;GsonArrayExample&gt;&gt; call, Throwable t) {

            }
        }
    );   
</code></pre><p><br><br>接下来是JsonObject：</p>
<pre><code>public interface GitHubRequestAPI {
    @GET(&quot;search/users&quot;)
    Call&lt;GsonObjectExample&gt; getGitHubSearch(@Query(&quot;q&quot;) String repoName);
}


Retrofit retrofit = new Retrofit.Builder()
        .baseUrl(&quot;https://api.github.com/&quot;)
        .addConverterFactory(GsonConverterFactory.create())
        .build();

GitHubRequestAPI gitHubRequestAPI = retrofit.create(GitHubRequestAPI.class);


Call&lt;GsonObjectExample&gt; call = gitHubRequestAPI.getGitHubSearch(&quot;retrofit&quot;);
call.enqueue(new Callback&lt;GsonObjectExample&gt;() {
        @Override
        public void onResponse(Call&lt;GsonObjectExample&gt; call, Response&lt;GsonObjectExample&gt; response) {
            GsonObjectExample gsonObjectExample = response.body();
            List&lt;GsonObjectExample.ItemsBean&gt; list = gsonObjectExample.getItems();
            for (int i = 0; i &lt; list.size(); i++) {
                Log.i(&quot;获得JsonObject中的login&quot;,&quot;:&quot;+list.get(i).getLogin());
                }
        }

        @Override
        public void onFailure(Call&lt;GsonObjectExample&gt; call, Throwable t) {

            }
        }
    );  
</code></pre><p><br></p>
<h2 id="总结"><a href="#总结" class="headerlink" title="总结"></a>总结</h2><p>通过两个Json例子，明白了<code>Call&lt;List&lt;Repo&gt;&gt;</code>中参数是<code>List&lt;Repo&gt;</code>的用法了吧。<br>另：如果在URL中需要传入多个参数的话，比如<code>https://api.github.com/search/repositories?q=retrofit&amp;since=2016-03-29&amp;page=1&amp;per_page=3</code>，可以使用<code>@QueryMap</code>：</p>
<pre><code>@GET(&quot;search/users&quot;)
Call&lt;GsonObjectExample&gt; getGitHubSearch(@QueryMap Map&lt;String,String&gt; map);

Map&lt;String,String&gt; map = new HashMap&lt;String, String&gt;();
map.put(&quot;q&quot;,&quot;retrofit&quot;);
map.put(&quot;since&quot;,&quot;2016-03-29&quot;);
...
Call&lt;GsonObjectExample&gt; call = gitHubRequestAPI.getGitHubSearch(map);
</code></pre><p>好啦，到此本次学习就到此结束啦，下次再见。</p>
<p>参考：<a href="http://blog.csdn.net/ljd2038/article/details/51046512" target="_blank" rel="noopener">Retrofit2.0使用详解</a><br>　　　<a href="http://square.github.io/retrofit/" target="_blank" rel="noopener">Retrofit官方网</a></p>

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